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 Accessing the Keyboard Services
   Service 00H (decimal 0): Read Next Keyboard Character
   Service 01H (decimal 1): Report Whether Character Ready
   Service 02H (decimal 2): Get Shift Status
   Service 03H (decimal 3): Set Typematic Rate and Delay
   Service 05H (decimal 5): Keyboard Write
   Service 10H (decimal 16): Extended Keyboard Read
   Service 11H (decimal 17): Get Extended Keystroke Status
   Service 12H (decimal 18): Get Extended Shift Status
 Comments and Example